CN115146781A - Parameter acquisition method and device for combined read signal and quantum control system - Google Patents
Parameter acquisition method and device for combined read signal and quantum control system Download PDFInfo
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Abstract
The invention provides a parameter acquisition method of a combined read signal, wherein the combined read signal is used for simultaneously reading quantum state information of a plurality of quantum bits, the plurality of quantum bits comprise a first quantum bit, and the parameter acquisition method comprises the following steps: setting a baseband frequency corresponding to the first qubit in the joint reading signal, and acquiring the baseband frequency corresponding to the remaining qubits in the joint reading signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits; obtaining a first power of the joint read signal; obtaining a plurality of first amplitudes for generating the joint read signal based on the first power, a second power and a second amplitude of a read signal during individual reading of each qubit; obtaining parameters for generating a joint read signal based on the obtained first power, all of the baseband frequencies, and all of the first amplitudes.
Description
Technical Field
The invention belongs to the field of quantum computing, and particularly relates to a parameter acquisition method and device for a combined read signal and a quantum control system.
Background
Quantum computation and quantum information are a cross discipline for realizing computation and information processing tasks based on the principle of quantum mechanics, and are closely related to disciplines such as quantum physics, computer discipline, informatics and the like. There has been rapid development in the last two decades. Quantum computer-based quantum algorithms for scenarios such as factorization, unstructured search, etc., exhibit performance far exceeding existing classical computer-based algorithms, and this direction is also being placed on expectations beyond existing computing capabilities.
The process of rapidly measuring the quantum state of the quantum bit by reading a signal is a key work for understanding the execution performance of the quantum chip, and the high accuracy of the quantum bit measurement result is always an important index continuously pursued by the quantum computing industry. The prior art grasps that the measurement result of a single qubit which is relatively mature and is not influenced by other qubits is determined, but a plurality of associated qubits have more practical and wide application prospects, the plurality of associated qubits of a quantum computing task are operated, the determination of the measurement results of the plurality of associated qubits is particularly important, the process of simultaneously determining the quantum state information of the plurality of qubits through a reading signal is called joint reading, and the acquisition method for the joint reading signal has no relevant records in the prior art.
Therefore, it is necessary to provide a parameter acquisition method for joint reading signals.
It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a parameter acquisition method and device of a combined read signal and a quantum control system, which can be used for solving the defects in the prior art and acquiring various parameters for generating the combined read signal.
In order to achieve the above object, a first aspect of the present application provides a parameter obtaining method for a combined read signal, where the combined read signal is used to simultaneously read quantum state information of a plurality of qubits, where the plurality of qubits includes a first qubit, and the parameter obtaining method includes:
setting a baseband frequency corresponding to the first qubit in the joint reading signal, and acquiring the baseband frequency corresponding to the remaining qubits in the joint reading signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits;
obtaining a first power of the joint read signal;
obtaining a plurality of first amplitudes for generating the joint read signal based on the first power, a second power and a second amplitude of the read signal during the individual read of each qubit;
obtaining parameters for generating a joint read signal based on the obtained first power, all of the baseband frequencies, and all of the first amplitudes.
Optionally, the cavity frequency of the first qubit is a median of the cavity frequencies of all the qubits.
Optionally, the obtaining a baseband frequency corresponding to a remaining qubit in the joint read signal based on a baseband frequency corresponding to the first qubit and cavity frequencies of all the qubits includes:
according to the relationship:
IF+f r =IF i +f ri
respectively obtaining baseband frequencies corresponding to the remaining qubits thereof, wherein IF is the baseband frequency corresponding to the first qubit, f r Is the cavity frequency, IF, of the first qubit i For the baseband frequency, f, corresponding to its residue sub-bits ri The cavity frequencies of the rest of the qubits.
Optionally, the obtaining the first power of the joint read signal includes:
and acquiring the first power of the combined reading signal based on the second power in the process of independently reading each quantum bit.
Optionally, the obtaining the first power of the joint read signal based on the second power in the individual read process of each qubit includes:
and acquiring the maximum value of second power of a read signal in the process of independently reading each quantum bit, and taking the maximum value of the second power as the first power.
Optionally, the obtaining the first power of the joint read signal based on the second power in the individual read process of each qubit includes:
and acquiring the maximum value of the second power of the read signal in the process of independently reading each quantum bit, and taking the maximum value of the second power plus a first value as the first power.
Optionally, the obtaining a plurality of first amplitudes for generating the combined read signal based on the first power, the second power of the read signal during the individual reading of each qubit, and the second amplitude includes:
the second power and the second amplitude of the read signal in the individual read process of each qubit, the plurality of first amplitudes used for generating the joint read signal, and the first power satisfy the relationship:
wherein, P 1 Is the first power, P 2 Is the second power, A 2 Is said second amplitude, A 1 Is said first amplitude value, c 1 、c 2 Is a constant.
Optionally, the obtaining parameters for generating a joint read signal based on the obtained first power, all the baseband frequencies, and all the first amplitudes includes:
the first power, all of the baseband frequencies, and all of the first amplitude values are used as parameters for generating the joint read signal.
In a second aspect, the present application provides a method for acquiring a combined read signal, including:
acquiring parameters for generating a combined read signal by using the parameter acquisition method for the combined read signal provided by the first aspect of the present application;
generating a low frequency joint read signal based on the parameters;
and performing up-conversion on the low-frequency combined reading signal to obtain the combined reading signal.
In a third aspect, the present application provides a storage medium, on which a computer program is stored, where the computer program is capable of implementing the parameter obtaining method for joint read signal provided in the first aspect of the present application when executed.
In a fourth aspect, the present application provides a parameter obtaining apparatus for jointly reading signals, the jointly reading signals being used for simultaneously reading quantum state information of a plurality of qubits, the plurality of qubits including a first qubit, the parameter obtaining apparatus comprising:
a baseband frequency acquisition module configured to set a baseband frequency corresponding to the first qubit in the joint read signal and acquire the baseband frequency corresponding to its remaining qubits in the joint read signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits;
a first power acquisition module configured to acquire a first power of the joint read signal;
a first amplitude acquisition module configured to acquire a plurality of first amplitudes for generating the joint read signal based on the first power, a second power of the read signal during individual read of each of the qubits, and a second amplitude;
a parameter acquisition module configured to acquire parameters for generating a joint read signal based on the acquired first power, all of the baseband frequencies, and all of the first amplitudes.
In a fifth aspect, the present application provides a quantum control system, where the quantum control system includes the parameter obtaining apparatus for a joint read signal provided in the fourth aspect of the present application, and is capable of implementing the parameter obtaining method for a joint read signal provided in the first aspect of the present application.
Compared with the prior art, the technical scheme of the application has the following beneficial effects:
the method for obtaining the parameters of the combined read signal comprises the steps of setting a baseband frequency corresponding to a first qubit in the combined read signal, obtaining baseband frequencies corresponding to other qubits based on the baseband frequency corresponding to the first qubit and cavity frequencies of all the qubits, obtaining a first power and a plurality of first amplitudes, obtaining parameters for generating the combined read waveform, and generating the combined read signal by using all the obtained baseband frequencies, all the first amplitudes and the first power, wherein the frequency spectrum of the combined read signal comprises the frequency corresponding to the cavity frequencies of all the qubits, so that the combined read signal can be used for simultaneously reading quantum state information of the qubits.
The method for obtaining the joint read signal, the device for obtaining the parameter of the joint read signal, the readable storage medium, and the quantum control system provided in the present application belong to the same inventive concept, and therefore have the same beneficial effects, and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a quantum chip;
FIG. 2 is a flowchart illustrating a method for obtaining parameters of a combined read signal according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of read fidelity when a qubit is read alone;
FIG. 4 is a graph illustrating read fidelity of the qubits in the joint read shown in FIG. 3;
FIG. 5 is a flowchart illustrating a method for obtaining a joint read signal according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a parameter obtaining apparatus for jointly reading signals according to an embodiment of the present application.
Wherein the reference numerals of fig. 6 are explained as follows:
110-baseband frequency acquisition module; 120-a first power harvesting module; 130-a first amplitude acquisition module; 140-parameter acquisition module.
Detailed Description
The following description will describe in more detail specific embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
The method provided by the embodiment of the application can be applied to a computer terminal or a quantum computer.
In a quantum computer, a quantum chip is a processor for performing quantum computation, referring to fig. 1, fig. 1 is a schematic structural diagram of a quantum chip, and it can be seen from the figure that a plurality of quantum bits and reading cavities which are in one-to-one correspondence and mutually coupled are integrated on the quantum chip, one end of each reading cavity, which is far away from the corresponding quantum bit, is connected to a reading signal transmission line integrally arranged on the quantum chip, and each quantum bit is coupled to an XY signal transmission line and a Z signal transmission line. The XY signal transmission line is used for receiving a quantum state regulation signal, the Z signal transmission line is used for receiving a magnetic flux regulation signal, the magnetic flux regulation signal comprises a bias voltage signal and/or a pulse bias regulation signal, both the bias voltage signal and the pulse bias regulation signal can regulate and control the bit frequency of the quantum bit, and the reading signal transmission line is used for receiving a reading signal and transmitting a reading feedback signal.
The process of quantum bit regulation and processing is briefly described as follows:
and adjusting the frequency of the quantum bit to the working frequency by utilizing the magnetic flux regulation and control signal on the Z signal transmission line, applying a quantum state regulation and control signal through the XY signal transmission line to carry out quantum state regulation and control on the quantum bit in the initial state, and reading the quantum state of the regulated quantum bit by adopting the reading cavity. Specifically, a carrier frequency pulse signal, which is generally called a "read detection signal" (hereinafter referred to as a "read signal"), is applied through a read signal transmission line, the read signal is generally a microwave signal with a frequency of 4 to 8ghz, and a quantum state of a qubit is determined by analyzing a read feedback signal output by the read signal transmission line. The fundamental reason that the read cavity is able to read the quantum state of a qubit is that the different quantum states of the qubit produce different chromatic dispersion shifts on the read cavity, so that the different quantum states of the qubit have different responses to a read signal applied on the read cavity, which is referred to as a read feedback signal. Only when the carrier frequency of the qubit's read signal is very close to the natural frequency of the read cavity (also called the resonant frequency, hereinafter "cavity frequency"), the read cavity will have a significant difference in response to the read signal due to the different quantum states of the qubit. I.e. the read feedback signal has a maximum distinguishability. Based on this, the quantum state where the qubit is located is determined by analyzing the read feedback signal with a certain pulse length, for example, converting each acquired read feedback signal into a coordinate point of an orthogonal plane coordinate system (i.e. an IQ plane coordinate system), and determining whether the corresponding quantum state is the |0> state or the |1> state according to the position of the coordinate point and the reading criterion, it can be understood that the |0> state and the |1> state are two eigenstates of the qubit.
The prior art grasps the measurement result of a mature single qubit which is not affected by other qubits, but a plurality of associated qubits have more practical and extensive application scenarios. Illustratively, two associated qubits running a dual quantum logic gate or a plurality of associated qubits running a multiple quantum logic gate. As another example, a plurality of associated qubits for running a quantum computing task, in which case the determination of the measurement of the plurality of associated qubits is particularly important.
In order to obtain a joint read signal for joint reading, an embodiment of the present application provides a method for obtaining a parameter of a joint read signal, referring to fig. 2, fig. 2 is a schematic flowchart of the method for obtaining a parameter of a joint read signal in an embodiment of the present application, and as can be seen from fig. 2, the method for obtaining a parameter of a joint read signal includes:
step S1: setting a baseband frequency corresponding to the first qubit in the joint reading signal, and acquiring the baseband frequencies corresponding to the joint reading signal and the rest of qubits based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits;
step S2: obtaining a first power of the joint read signal;
and step S3: obtaining a plurality of first amplitudes for generating the joint read signal based on the first power, a second power and a second amplitude of the read signal during the individual read of each qubit;
and step S4: obtaining parameters for generating a joint read signal based on the obtained first power, all of the baseband frequencies, and all of the first amplitudes.
The method for obtaining the parameters of the combined read signal comprises the steps of setting a baseband frequency corresponding to a first qubit in the combined read signal, obtaining baseband frequencies corresponding to other qubits based on the baseband frequency corresponding to the first qubit and cavity frequencies of all the qubits, obtaining a first power and a plurality of first amplitudes, obtaining parameters for generating the combined read waveform, and generating the combined read signal by using all the obtained baseband frequencies, all the first amplitudes and the first power, wherein the frequency spectrum of the combined read signal comprises the frequency corresponding to the cavity frequencies of all the qubits, so that the combined read signal can be used for simultaneously reading quantum state information of the qubits.
In step S1, the first qubit may be any one of qubits participating in joint reading on a quantum chip, and a baseband frequency corresponding to the first qubit is set, where the baseband frequency is used to generate a joint reading signal, and the joint reading signal generated based on the baseband frequency can be used to obtain quantum state information of each qubit participating in joint reading after being subjected to up-conversion;
specifically, in step S1, the cavity frequency of the first qubit is a median of the cavity frequencies of all the qubits participating in the joint reading, and in this embodiment, the baseband frequency corresponding to the first qubit may be set to be 600MHz.
Specifically, in step S1, obtaining baseband frequencies corresponding to the remaining qubits in the joint read signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits includes:
the cavity frequency of the first qubit, the baseband frequency corresponding to the first qubit, the cavity frequencies of the remaining qubits and the baseband frequencies corresponding to the remaining qubits satisfy a relationship:
IF+f r =IF i +f ri
where IF is the baseband frequency corresponding to the first qubit, f r Is the cavity frequency, IF, of the first qubit i For the base-band frequency, f, corresponding to some other qubit ri The cavity frequency of some other qubit.
In practical applications, the applicant finds that, in a single reading process of qubits, a read signal is composed of two parts, an intermediate frequency signal generated by an AWG waveform generator (i.e., a baseband frequency in this application) and a local oscillator signal, and the read signal is synthesized by the intermediate frequency signal generated by the AWG waveform and the local oscillator signal through a mixer, and the frequencies of the two parts have the following relationship:
IF+f r =LO
wherein LO is the frequency of the local oscillator signal, IF is the frequency of the intermediate frequency signal generated by the AWG waveform generator, f r To read the frequency of the signal (i.e., the cavity frequency, since the reading process requires the frequency of the read signal to be consistent with the cavity frequency).
In order to realize the joint reading signal, the same local oscillator signal is needed to be adopted for the reading signals of all the qubits participating in the joint reading, and in combination with the relationship among the local oscillator signal, the baseband frequency and the cavity frequency given above, the applicant gives that the baseband frequency and the cavity frequency among the qubits participating in the joint reading should satisfy: IF + f r =IF i +f ri Therefore, after the baseband frequency corresponding to the first qubit is fixed, it needs to be determined according to the formula IF + f r =IF i +f ri And correspondingly setting baseband frequencies corresponding to the rest of the qubits. Based on the scheme, the baseband frequency corresponding to the read signals of all the qubits participating in the joint reading can be obtained.
For example, in one embodiment, it is necessary to read quantum state information of three qubits, cavity frequencies of the three qubits are respectively 6.2GHz, 6.3GHz, and 6.4GHz, where IF the median of the cavity frequencies of all qubits is 6.3GHz, the qubit with the cavity frequency of 6.3GHz is the first qubit, the baseband frequency corresponding to the first qubit is set to 600MHz, and IF + f is according to the formula r =IF i +f ri The baseband frequency corresponding to the remaining two qubits can be obtained, specifically, the baseband frequency corresponding to the qubit having a cavity frequency of 6.2GHz is 700MHz, and the baseband frequency corresponding to the qubit having a cavity frequency of 6.4GHz is 500MHz.
Additionally, the cavity frequency of the first qubit may also be the minimum value of the cavity frequencies of the qubits participating in the joint reading, and in the case of three qubits also used for reading the cavity frequencies of 6.2GHz, 6.3GHz, and 6.4GHz, respectively, the cavity frequencies and the formula IF + f are used according to r =IF i +f ri And acquiring three baseband frequencies, wherein the cavity frequency of 6.2GHz is the minimum value of all the cavity frequencies, the qubit with the cavity frequency of 6.2GHz is a first qubit, the baseband frequency corresponding to the cavity frequency of 6.2GHz is set to be 600MHz, and the baseband frequencies corresponding to the qubits with the cavity frequencies of 6.3GHz and 6.4GHz are respectively 500MHz and 400MHz.
Additionally, the cavity frequency of the first qubit may also be a maximum value of the cavity frequencies of the qubits participating in the joint reading, and in the case of three qubits respectively having the same cavity frequencies of 6.2GHz, 6.3GHz, and 6.4GHz for reading, the cavity frequency of 6.4GHz is a maximum value of the cavity frequencies of all the qubits participating in the joint reading, and then the cavity frequency of the first qubit is 6.4GHz, and a baseband frequency corresponding to the qubit having the cavity frequency of 6.4GHz is set to 600MHz, and then IF + f is according to a formula r =IF i +f ri The baseband frequencies corresponding to the qubits with cavity frequencies of 6.2GHz and 6.3GHz can be obtained as 800MHz and 700MHz, respectively.
Additionally, the selection of the baseband frequency corresponding to the first qubit is not specifically limited.
In order to obtain a signal that can be used for joint reading, power and amplitude parameters are obtained in addition to the baseband frequency corresponding to the qubits involved in the joint reading.
Since there is only one read channel per read signal transmission line, the joint read signals must share one read power during the joint read process.
In step S2, obtaining the first power of the joint reading signal includes:
acquiring the first power based on the second power of each quantum bit participating in joint reading in the independent reading process; the second power is a power parameter of a read signal of each qubit in a separate read process.
Specifically, in order to enable the joint reading to have higher reading fidelity, the second power of the reading signal in the individual reading process of each qubit can be obtained, and the maximum value in the second power is selected as the first power of the joint reading signal.
In order to further improve the reading fidelity of the joint reading, a first value may be added to the maximum value of the second power as the first power of the joint reading signal, and in this embodiment, when the first value is 10dB, the reading fidelity of the joint reading signal has the optimal effect.
Additionally, the second power in the separate reading process of the remaining qubits may also be selected as the first power, which is not specifically limited herein.
In step S3, obtaining a plurality of first amplitudes used for generating the joint read signal based on the first power, the second power of the read signal in the process of separately reading each qubit, and the second amplitude, includes:
the second power and the second amplitude of the read signal in the individual read process of each qubit, the plurality of first amplitudes used for generating the joint read signal, and the first power satisfy the relationship:
wherein, P 1 Is the first power, P 2 Is the second power, A 2 Is said second amplitude, A 1 Is the first amplitude.
It should be noted that, in the present embodiment, c 1 And c 2 All are set to-20, and in other embodiments, other values may be set, which are not described herein.
Based on the above steps, a plurality of first amplitudes used for generating the joint reading signal can be obtained, and the plurality of first amplitudes respectively correspond to the respective qubits participating in the joint reading, so that the effect of the joint reading is more accurate.
In step S4, parameters for generating a joint read signal, that is, the acquired first power, the baseband frequency corresponding to the qubits participating in the joint read, and the second amplitude corresponding to the qubits participating in the joint read, that is, the parameters for generating the joint read signal, are acquired based on the acquired first power, the baseband frequency, and the plurality of first amplitudes.
Based on the same inventive concept, the present application further provides a method for acquiring a joint read signal, referring to fig. 5, where fig. 5 is a schematic flow chart of the method for acquiring a joint read signal provided in this embodiment, and the method for acquiring a joint read signal includes:
step T1: acquiring parameters for generating a combined reading signal by using the parameter acquiring method for the combined reading signal provided by the embodiment of the application; the parameters include: a baseband frequency corresponding to the qubits participating in the joint reading, a first amplitude corresponding to the qubits participating in the joint reading and a first power;
and step T2: generating a low-frequency joint read signal based on the parameters, a frequency spectrum of the generated joint read signal including the baseband frequencies corresponding to the respective qubits;
step T3: and performing up-conversion on the low-frequency combined reading signal to obtain the combined reading signal, wherein the frequency spectrum value of the up-converted combined reading signal is equal to or close to the cavity frequency of each quantum bit participating in the combined reading.
Referring to fig. 3 and 4, fig. 3 is a schematic diagram showing the reading fidelity of a single-qubit reading in the IQ coordinate system, fig. 4 is a schematic diagram showing the reading fidelity of the joint-qubit reading in the IQ coordinate system shown in fig. 3, the |0> state reading fidelity of the single-qubit reading is 0.9066, the |1> state reading fidelity is 0.8658, in fig. 4, the |0> state reading fidelity of the joint-qubit reading is 0.8902, and the |1> state reading fidelity is 0.828.
The method for obtaining the joint read signal provided in this embodiment can obtain a joint read signal for joint reading, so as to obtain quantum state information of each qubit at the same time.
Based on the same inventive concept, the present application provides a parameter obtaining apparatus for a combined read signal, referring to fig. 6, where fig. 6 is a schematic structural diagram of the parameter obtaining apparatus for a combined read signal provided in an embodiment of the present application, where the combined read signal is used to simultaneously read quantum state information of multiple qubits, the multiple qubits include a first qubit, and the parameter obtaining apparatus for a combined read signal includes:
a baseband frequency obtaining module 110 configured to set a baseband frequency corresponding to the first qubit in the joint read signal, and obtain a baseband frequency corresponding to its remaining qubits in the joint read signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits;
a first power acquisition module 120 configured to acquire a first power of the joint read signal;
a first amplitude obtaining module 130 configured to obtain a plurality of first amplitudes for generating the combined read signal based on the first power, a second power of the read signal during individual reading of each of the qubits, and a second amplitude;
a parameter obtaining module 140 configured to obtain parameters for generating a joint read signal based on the obtained first power, all of the baseband frequencies, and all of the first amplitudes.
Based on the same inventive concept, the application also provides a quantum control system, which comprises the parameter acquisition device of the combined reading signal, and can realize the parameter acquisition method of the combined reading signal.
Based on the same inventive concept, the present application further provides a readable storage medium, on which a computer program is stored, which, when executed, can implement the parameter obtaining method of the joint read signal as described above.
The readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device, such as, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. The computer programs described herein may be downloaded from a readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives the computer program from the network and forwards the computer program for storage in a readable storage medium in the respective computing/processing device. Computer programs for carrying out operations of the present invention may be assembly instructions, instruction Set Architecture (ISA) instructions, machine related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer program may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the invention are implemented by personalizing a custom electronic circuit, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), with state information of a computer program, the electronic circuit being operable to execute computer-readable program instructions.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example" or "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A parameter obtaining method of a combined read signal, wherein the combined read signal is used for simultaneously reading quantum state information of a plurality of qubits, and the plurality of qubits include a first qubit, the parameter obtaining method comprising:
setting a baseband frequency corresponding to the first qubit in the joint reading signal, and acquiring the baseband frequency corresponding to the remaining qubits in the joint reading signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits;
obtaining a first power of the joint read signal;
obtaining a plurality of first amplitudes for generating the joint read signal based on the first power, a second power and a second amplitude of the read signal during the individual read of each qubit;
obtaining parameters for generating a joint read signal based on the obtained first power, all of the baseband frequencies, and all of the first amplitudes.
2. The method of claim 1, wherein the cavity frequency of the first qubit is a median of the cavity frequencies of all the qubits.
3. The method of claim 1 or 2, wherein the obtaining the baseband frequency corresponding to the remaining qubits in the joint read signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits comprises:
according to the relationship:
IF+f r =IF i +f ri
respectively obtaining baseband frequencies corresponding to the remaining qubits thereof, wherein IF is the baseband frequency corresponding to the first qubit, f r Is the cavity frequency, IF, of the first qubit i For the baseband frequency, f, corresponding to its residue sub-bit ri The cavity frequencies of the rest of the qubits.
4. The method of claim 1, wherein the obtaining the first power of the joint read signal comprises:
and acquiring the first power of the combined reading signal based on the second power in the individual reading process of each quantum bit.
5. The method of claim 4, wherein the obtaining the first power of the joint read signal based on the second power of each qubit during separate read comprises:
and acquiring the maximum value of second power of a reading signal in the process of independently reading each quantum bit, and taking the maximum value of the second power as the first power.
6. The method of claim 4, wherein said deriving the first power of the joint read signal based on the second power of each qubit in the individual read process comprises:
and acquiring the maximum value of the second power of the read signal in the process of independently reading each quantum bit, and taking the maximum value of the second power plus a first value as the first power.
7. The method of claim 1, wherein said deriving a plurality of first amplitudes for generating the combined read signal based on the first power, a second power of the read signal during individual reading of each of the qubits, and a second amplitude comprises:
the second power and the second amplitude of the read signal in the individual read process of each qubit, the plurality of first amplitudes used for generating the joint read signal, and the first power satisfy the relationship:
wherein, P 1 Is the first power, P 2 Is the second power, A 2 Is said second amplitude, A 1 Is said first amplitude value, c 1 、c 2 Is a constant.
8. The method of claim 1, wherein said obtaining parameters for generating a joint read signal based on said obtained first power, all of said baseband frequencies, and all of said first amplitudes comprises:
the first power, all of the baseband frequencies, and all of the first amplitude values are used as parameters for generating the joint read signal.
9. A method for obtaining a combined read signal, comprising:
acquiring parameters for generating a combined read signal by using the method for acquiring parameters of a combined read signal according to any one of claims 1~8;
generating a low frequency joint read signal based on the parameters;
and performing up-conversion on the low-frequency combined reading signal to obtain the combined reading signal.
10. A storage medium having stored thereon a computer program enabling, when executed, a method of parameter acquisition of a joint read signal as claimed in any one of claims 1~8.
11. A parameter obtaining apparatus for combining read signals, wherein the combined read signals are used for simultaneously reading quantum state information of a plurality of qubits, the plurality of qubits including a first qubit, the parameter obtaining apparatus comprising:
a baseband frequency acquisition module configured to set a baseband frequency corresponding to the first qubit in the joint read signal and acquire the baseband frequency corresponding to its remaining qubits in the joint read signal based on the baseband frequency corresponding to the first qubit and the cavity frequencies of all the qubits;
a first power acquisition module configured to acquire a first power of the joint read signal;
a first amplitude obtaining module configured to obtain a plurality of first amplitudes for generating the combined read signal based on the first power, a second power of the read signal during individual reading of each of the qubits, and a second amplitude;
a parameter acquisition module configured to acquire parameters for generating a joint read signal based on the acquired first power, all of the baseband frequencies, and all of the first amplitudes.
12. A quantum control system comprising the apparatus for obtaining parameters of a combined read signal according to claim 11, wherein the method for obtaining parameters of a combined read signal according to claim 1~8 can be implemented.
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